Loop-switch



(No Model.)

W. M. GOODRIDGE LOOP SWITCH.

NO. 455,747. Patented July 14,1891.

UNITED STATES PATENT CEEICE.

lVILLlAM M. GOODRIDGE, F HIGHLAND PARK, ASSICNOR T() THE \VESTERNELECTRIC COMPANY, CF CHICAGO, lLl'ilNClS.

LOOP-SWITCH.

SPECIFICATION forming part of Letters Patent No. 455,747, dated July 14,1891.

Application filed March 4, 1887. Serial No, 229,667. (No model.)

To all whom t may concern: handle serving to turn the cylindcrback andBe it known that I, WILLIAM M. GOOD- forth in its bearing. On theopposite ends RIDGE, a citizen of the United States, residof this rollerare mounted the symmetrical ing at Highland Park, in the county of Lakesprings or levers g 71,. These levers are so 5 and State of Illinois.have invented a certain adjusted as to press at all times against thenew and useful Improvement in Loopcontact-pieces fi 1.', as shown. Thedil't'erent Switches, of which the following is a full, cords of a pairmay be permanently conclear, concise, and exact description, refernectedwith contact-pieces 1' 1, and hence with ence being had to theaccompanying drawthe springs g 71, respectively. Thus lever g oo toings, forming a part of this specification. will at all times beconnected with one cord My invention relates to electric switches of thepair, while lever 71l will be always confor looping in and outalternately different nected with the other cord. Theclearinginstruments. out shutters may be included between the My switchis especially designed for use as contact-pieces m and the telephone maybe oi; apart of the key-board apparatus of a teleincluded between thecontact-pieces o p. As

phone exchange. long, therefore, as the switch is in the posi- 4Myinvention is illustrated in the accomtion shown-that is, with the springg rcst- 4 panying drawings, in which Figure lis aside ing againstcontact o and spring` h against elevation of my loop-switch. Fig. 2 is aseccontact p-the telephone will be looped into 7o zo tional Viewthereof. Fig. 3 is an end elevathe cords. Cn moving the handle in theoption showing the two pairs of contact-pieces posit'e direction thesprings g 7L will be sepaor terminals. Fig. 4 is a viewof the oppositerated from the contacts o p, respectively, and end of the switch,showing terminal plates or connected, respectively, with contact-pieceslconnections of the line. Fig. 5 is a plan on., thus bringing theclearing-out annuncia- 75 z5 showingthe escutcheon and slideforpreventtor into circuit. lt will be noted that the ing dirt fromfalling into the switch. Fig. U springs g L are mounted, respectively,on opis a horizontal sectional View showing the posite ends of thecylinder f, a screw passing manner of mounting the contact-springs.through cach of said springs into the cylin- Like parts are indicated bysimilar letters der. The screw in each case bends its spring So 3o ofreference throughout the different figures. inwardly at the center, andthus a uniform The board or shelf d is usually of wood and and evenbearing is obtained between the in a telephone exchange is -placeddirectly in springs and their contact-pieces, respectively. front of theswitch-board as a part of the out- This is d ue to the 'fact that thecylinder upon fit. Through this shelt` is cut a downwardlywhich thesprings are mounted is loose in its 85, tapering opening for the handleZ), by means bearings and free to movc longitudinally, ex-

of which the switch is moved back and forth cept as prevented by thesprings. by hand. Over this opening is placed thc llaving thus describedmy invention, l escutcheon c, which is stamped out', preferclaim as newand desire to secure by Letters ably, of the form shown and bentupwardly, Patentoo 4o so as to afford room for the slide d, which is l.ln a loop-switch, the combination, with fitted to the handle and iscarried backward the handle, of a cylinder of insulating mateand forwardtherewith in the guide formed rial, two springs mounted near theircenter, under the escutcheon. Thus dirt is preone upon each end ofthecylinder,insulated vented from falling into the switch aboutthecontact-pieces included between one pair of 95 handle. The block ofinsulating material c opposing ends of the two springs, and other isattached below the shelf. This block is insulated contact-pieces adaptedto be .inpreferably of rubber or vuleanite and serves eluded between theother pair of opposing as a frame or support for the different partsends of the two springs when the handle is ofthe switch. moved to theproper position, substantially loo 5o The handle is inserted in thecylinder or in the manner and for the purpose specified. rollerf, whichis of insulating material, the 2. The combination, with the symmetrical5 p, and means for moving` said springs beek springs g h, of theinsulated pieces or termii In Witness whereof I hereunto subscribenalsz' 7o, against which said splingsare pressed my name this 0th day ofJanuary, A. D. 1887.

by their own tension, respectively, and the opy y s 1 positeeontaet-pieoes o1' terminals Z m and 0- W ILLIAM M' GOODRIDGE'Witnesses:

WM. M. GLLER,

and forth between contact-pieces lm and op,

GEORGE P. BARTON.

substantially as and for the purpose specified.

